This may sound a bit unusual, but giving testimonials for products or services which you find useful can be another moderately effective way of improving the link popularity of your site. If you really like a product, simply write to the company and tell them why you liked the product so much and how it has helped you. Chances are, the company will write back to you to thank you for your comments and will ask you for permission to display your comments in their web site. Tell the company that you have no problems if they publish your comments, but request them to add a link to your site along with the testimonial. There is every possibility that the company will agree since publishing the URL of your web site gives more credibility to the testimonial.
Of course, please don't go about giving testimonials to every company you can locate just because it will improve your link popularity!
Posting to Message Boards and Discussion Lists
Another moderately effective method of increasing the link popularity of your site is to post to online message boards. At the end of every message that you post, you can sign off by mentioning your name and the URL of your web site. If the message board allows it, you can even include a short promotional blurb about your site at the end of your posts. However, make sure that the individual messages that are posted to that message board are archived in static HTML pages (i.e. the URLs for the individual messages should not contain a "?"). Otherwise, the search engines will consider these pages to be dynamic pages and may not spider these pages and hence, will not be able to find your link.
Email based discussion lists which are archived on the web in static HTML pages can also be used to boost the link popularity of your site in a similar manner. In this case, the signature file that you use with your email program should contain the URL for your web site.
Starting a Link Contest
A good method of improving the link popularity of your site is to give away prizes to other webmasters if they link to you. The prizes that you give out should ideally be something which other webmasters will find valuable enough to want to link to you, but which do not cost you too much. For instance, if you publish a newsletter, and have unsold ad inventory, you can give away some free advertisements in your newsletter to the winners. If you sell a software (or an ebook), you can give away a free copy of your software or ebook to the winners, since it doesn't cost you anything to produce an additional copy of digital goods like software and ebooks.
Link contests work best if you run the contest on a continuous basis and if you declare new winners frequently. If you run the contest for a few months, and then stop it, the webmasters who had linked to you will all remove their links. However, if you run it on a continuous basis, and declare new winners every month or so, the webmasters will have the incentive to keep their links to your site.
Also, make sure that you require all participants to have a link to your site either in their home page, or in an internal page of their site which is linked to their home page. Also ensure that the page which contains the link is no more than two levels deep from their home page (i.e. it should not take more than two clicks to go from the home page to the page containing the link). If they don't do this, the search engine spiders may not index the page which contains the link to your site, and hence, may not find your link.
